Pen



FIG. 1 is a perspective view showing my new design for a pen;

FIG. 2 is a front view showing the pen of FIG. 1;

FIG. 3 is a rear view showing the pen of FIG. 1;

FIG. 4 is a left view showing the pen of FIG. 1;

FIG. 5 is a right view showing the pen of FIG. 1;

FIG. 6 is a top view showing the pen of FIG. 1;

FIG. 7 is a bottom view showing the pen of FIG. 1; and,

FIG. 8 is an exploded perspective view of the pen of FIG. 1.

The broken lines in the drawings are included for the purpose of illustrating portions of the pen that form no part of the claimed design. 

CLAIM I claim the ornamental design for a pen, as shown and described. 